c-cor c-p-c c-pop ccccc co-co co-op cocc- cocco cocto coopt coppo copr- copro copto corfo coro- corop corot corto cott- cotto cpcfc cpctc croco croft croop croot cropc cropo crott forro forto fprot frcpc froop froot ftrtt ocftc octo- octor offof offto ofoto ofpop ooooo opto- optot optto orcop orfor oroco ortoo ototo otpor pctct pforp po-po pocop poopo poort popco popop poppo porco poro- porro porto potco potoc potof potoo potop potor potro potto proff proft proof proor proot prop- propp propr propt prot- proto prtor ptprc ptprf ptpro ptprr ptprt r-co- ro-ro rocco rocor rofor rooft roto- rotor rotot rotto rprop rptor t-pop t-top tocco toco- toffo tofop tofor topo- topof topor topot toppo topto torpo torro torto toto- totoo totop tprot troco troff troft troop trop- tropo trott ttttt